mellifluous

The story

1. Latin · derived frommellifluus“flowing like honey”
2. Middle English · inherited frommellifluous, mellyfluous
3. English todaymellifluous

From Middle English mellifluous, mellyfluous, from Latin mellifluus (“flowing like honey”) + -ous, from mel (“honey”) + fluō (“flow”). Compare superfluous and fluid, from same root, and with dulcet (“sweet speech”), alternative Latinate term with a similar meaning.